Abstract
The microstructural mechanism of the strength differential (SD) effect in polycrystalline pure magnesium with rolling texture is numerically investigated by rate-dependent crystal plasticity finite element analysis. The present analysis method considers basal slip, prismatic slip, first-order pyramidal slip, and second-order pyramidal slip, as well as deformation twinning due to c-axis tension. Critical resolved shear stresses (CRSS) of single crystal pure magnesium reported in the literatures are used for the material parameters in the analysis. The SD effect in a numerically generated material, which has a strong texture typical of rolled magnesium, is examined by simulating tensile and compressive tests. The results show a significant SD effect due to deformation twinning. The results of simulations that do not take deformation twinning into account, however, still show a non-negligible SD effect. This persistent SD effect, which has no relation to the twinning, is explained in terms of lattice rotation and different CRSS on different slip systems.
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